The program of Fertility Behaviour of Slovenian Residents as a part of an international project Fertility and Family Survey (FFS) contributed to a better understanding of fertility behaviour of Slovenian population in the framework of large cultural and national differences in Europe. Applied theoretical starting-points (delayed entry into adulthood, new forms of households and new ways of family formation, increasing individualism) enabled us to verify the presumption of the theory of second demographic transition. At the same time, with the use of the event history analysis methodology, we enhanced the understanding of the fertility behaviour by considering the complete life career of individuals. On the basis of our timely and well-accomplished work we were invited to join the Informal Working Group (IWG) of specialists involved in the preparation of the framework for a new longitudinal research of population dynamics - Gender and Generation Program (GGP). The main results of the Slovenian FFS are the following: -Elaborated outline of "contraceptive image" of Slovenia. -Ascertained characteristics of the new patterns of entry into adulthood in Slovenia and their relation to the family formation and parenthood. -Methodological achievements: the results based on the item nonresponse analysis should be considered as an important source of information regarding the quality of the reported data. -Detailed analysis of fertility behaviour in Slovenia considering urban and rural areas revealed that measures intended to stimulate parenthood should incorporate the characteristics of these specific areas - their social context.